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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Synthesis of Nanocrystalline CeO2-ZrO2 Solid Solutions by a Citrate Complexation Route:A Thermochemical and Structural Study
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Synthesis of Nanocrystalline CeO2-ZrO2 Solid Solutions by a Citrate Complexation Route:A Thermochemical and Structural Study

机译：柠檬酸盐络合途径合成纳米晶CeO2-ZrO2固溶体的热化学和结构研究

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摘要

The synthesis of nanocrystalline solid solutions of general formula Ce_xZr_(1-x)O2(x=0.1,0.25,0.5,0.75,and 0.9)using a citrate complexation technique was followed with thermochemical methods,and the resulting powders were characterized using X-ray diffraction(XRD)and electron microscopy(scanning electron microscopy and high-resolution transmission electron microscopy(HRTEM)).Qualitative analysis of XRD data indicated that the samples exhibited either a cubic(Fm3m)or a tetragonal(P4_2mc)phase,depending on CeO2 content.Electron diffraction results were consistent with the XRD findings.In HRTEM,the internal crystal structure of the nanoparticles was observed to be highly ordered and primary particle size data were collected.Average crystallite size,obtained from the XRD data,was 4.8-8.3 nm,with the larger values at the compositional extremes.A similar trend was observed in HRTEM,although values were generally slightly higher.The Ce_(0.5)Zr_(0.5)O2 solid solution had the smallest crystallites(4.8 nm)and the highest specific surface area(45.8 m~2·g~(-1)).
机译：利用柠檬酸盐络合技术合成了通式为Ce_xZr_（1-x）O2（x = 0.1,0.25,0.5,0.75,0.9）的纳米晶固溶体，并通过热化学方法进行了合成，并利用X-射线衍射（XRD）和电子显微镜（扫描电子显微镜和高分辨率透射电子显微镜（HRTEM））。对XRD数据的定性分析表明，样品呈现立方（Fm3m）或四方（P4_2 / nmc）相，电子衍射结果与XRD结果一致。在HRTEM中，观察到纳米颗粒的内部晶体结构是高度有序的，并收集了一次粒径数据。从XRD数据获得的平均晶粒尺寸为4.8-8.3 nm，在极端值处具有较大的值。在HRTEM中观察到相似的趋势，尽管通常略高。Ce_（0.5）Zr_（0.5）O2固溶体具有最小的晶体晶格（4.8 nm）和最高比表面积（45.8 m〜2·g〜（-1））。

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